In my opinion, markdown, LaTeX, HTML, ... is all a cognitive overhead distracting you form writing your content. That is why I started to work on MonsterWriter [1]
Weird, I had the same thought two weeks ago - I just wanna tell a story, and everything else is simply a distraction. I thought "Why not a simple webapp that presents nothing but a textarea/contenteditable" :-)
Anyway, I am happier creating native (desktop) applications than webapps, except that I don't think that there is a market anymore for them. How well is your native desktop app doing? Is there a large enough market for applications that need to be installed locally only? How do you market these?
[1] https://www.monsterwriter.app/